linux-kernel - HPET causes tasks to freeze (still in 2.6.36-rc6)

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Date:	Mon, 04 Oct 2010 17:36:17 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	LKML <linux-kernel@...r.kernel.org>
CC:	clemens@...isch.de, venki@...gle.com,
	Thomas Gleixner <tglx@...utronix.de>,
	the arch/x86 maintainers <x86@...nel.org>
Subject: HPET causes tasks to freeze (still in 2.6.36-rc6)

Hi,

HPET as a clocksource has still issues in the latest kernels (confirmed
in 2.6.36-rc6) at least on x86_64. Unless clocksource=jiffies,
clocksource=tsc or nolapic_timer is used, the system is unusable. Tasks
are not woken unless mouse is moved, key is pressed (or other hard irq
triggered). 2.6.32 seems to be the last working.

The bug was originally reported in the bugzilla here:
https://bugzilla.novell.com/show_bug.cgi?id=579932

To quote:
"My clock is seriously lagging behind. After having used hpet for 10.5
hours now, the clock is 5.5 hours too late!"

dmesg is attached. Any ideas what's still wrong with HPET?

thanks,
-- 
js
suse labs

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